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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
45/X = 100 // - 100
45/X-100 = 0
45*X^-1 = 100 // : 45
X^-1 = 20/9
-1 < 0
1/(X^1) = 20/9 // * X^1
1 = 20/9*X^1 // : 20/9
9/20 = X^1
X = 9/20
X = 9/20
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